<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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  <body>
    <div id="box" style="color: red; font-size: 40px">hello box</div>
    <script>
      const box = document.getElementById("box");
      console.log(box.style.color);
      console.log(box.style.fontSize);

      setTimeout(() => {
        box.style.backgroundColor = "yellow";
        box.style.color = "";
      }, 3000);
    </script>
  </body>
</html>
